JPH096329A - Keyboard device for electronic musical instrument and production of its massive body - Google Patents

Abstract

PURPOSE: To deal with the problem of burrs accompanying metallic materials and the problem of difficulty in working and to make the weight lighter by integrally forming a mass-concentrating part consisting of a bar-shaped metallic material and a resin part having an oscillation supporting part. CONSTITUTION: A massive body 6 consisting of the mass concentrating part 4 and the resin part 5 is oscillably mounted on the lower side of a key 1. The mass concentrating part 4 consists of a metallic rod formed by drawing of, for example, an iron material and is cut to have a prescribed length. The front end 4a of the metallic rod 4 forms a turn back protective film 4b. Thereby, the mass at front end of the metallic rod is increased and the rotating moment of the mass body 6 at the time of key touch operation is increased, and the heavy feel at the time of key touch is increased. The resin part 5 is fixed to the root part of the metallic rod 4. The resin part 5 is integrated and mounted by outsert molding and the burrs accompanying the conventional blanking, etc., are not produced. Since the bar-shaped metallic material is used, the useless consumption of the materials is averted and the cost reduction is made possible.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a keyboard device for an electronic musical instrument, and more particularly to a mass body which constitutes a hammer thereof and a manufacturing method thereof.

[0002]

2. Description of the Related Art A keyboard device for an electronic musical instrument is provided with a mass body such as a hammer corresponding to each health in order to obtain a heavy touch feeling similar to the touch feeling of a natural musical instrument. JP-A-63-125996). This hammer moves in conjunction with each key-pressing motion of each person, and imparts a force corresponding to the motion as a reaction to the key-pressing force to obtain a desired key-touch feeling. Conventionally, such a hammer is mainly made of a metal material and is incorporated in the lower part of each key.

[0003]

However, the conventional keyboard device imposes a number of restrictions on the hammer due to the fact that the hammer is incorporated in the lower part of each key. First of all, I want to move as much as possible in conjunction with the key, but the key guide,
There are many components that should be placed under the key, such as the key switch, the force transmission part of the key interlock, the hammer and the upper and lower limit stoppers of the key, the return spring of the key and the hammer, and the shape of the hammer, the movable range, and the weight of the hammer. The product is constructed with significant restrictions. The reason why the product is intentionally added here is that it has an additional element of being friendly in addition to the idea. Friendly is a symbolic word with an infinite number of good and selling product elements. That is, the more friendly elements such as cheap, light, thin, safe, durable, long-lasting (small change over time), easy assembly, and good touch feeling, the more hit products become hit products.
Let's apply these points to the conventional keyboard. First,
Due to the above-mentioned various restrictions, the force transmitting portion is arranged in the substantially central portion of the key. For this reason, the movable range of the hammer corresponding to the full stroke of the key must be reduced. Otherwise, the vertical thickness of the keyboard will be large. Further, since the stroke of the force transmitting portion is small, the driving accuracy of the key and the hammer is required, resulting in high cost. Furthermore, since the range of motion is small, the weight of the hammer is increased to obtain an appropriate touch feeling (feeling of popping). In order to increase this weight and due to structural and structural restrictions, the hammer must be shaped into a substantially S-shape. For this reason, the metal material that is the main part of the hammer is formed by punching, cutting or pressing. I had no choice but to do it. For this reason, burrs are always generated after processing, and post-processing such as grinding and polishing is necessary to remove the burrs. Further, in order to reliably receive the inertial force of the hammer when pressing the key, it was necessary to outsert with a resin so as not to destroy the stopper felt even after the above-mentioned post-processing. To put it to the extreme, if the post-processing makes the area of the felt facing part large and round it, the outsert may not be necessary, but the processing cost will be added to the product and it will be expensive, as well as purchase. Even if it's good for a while,
If you press the key tens of thousands of times thereafter, the felt loses its elastic recovery.

However, the components to be arranged (especially on the hammer side) are indispensable regardless of the shape of the hammer. Therefore, it was unavoidable in the past to outsert the force transmission section and the switch actuator section, which required precision, with polyacetal or the like, and the hammer tip section with soft vinyl chloride. That is, the two different outserts were given, knowing that the processing would be complicated.

It is assumed that this outsert is temporarily performed by using only polyacetal, which is more expensive than PVC, and ignoring the "expensive" element from the viewpoint of easy processing. Then, at the time of outsert, a difference in thermal stress occurs due to the difference in the coefficient of thermal expansion between the metal and the resin. This thermal stress difference may occur not only at the time of manufacturing but also when flying in the stratosphere of Alaska by airplane, for example, and immediately after being transported to another country, the spotlight of the heated venue is played on the stage where the spotlight was lit. Even in such a case, a thermal stress difference caused by an extreme temperature difference occurs.
In addition, there is a difference in stress absorbability against an impact when a key is pressed, and a crack is generated at a joint portion between a resin and a metal due to the difference in thermal stress, the difference in stress absorbability and the like. These cracks cause rattling, vibration or noise of the hammer as the performance is repeated. In particular, such cracks are likely to occur where there are burrs.

Lastly, regarding the touch feeling at the time of key depression, the short-circuit thinking that only heavy weight is necessary to obtain the feeling of resilience (weight feeling) at the time of key depression is obscure.
On the one hand, it is true, but it does not take into account the key release time. A spring, a key, a hammer, or their own weight is used to restore the key.To make the key heavy, the reaction force of the finger contact part is made large, and while the reaction force is appropriately suppressed, the piano seesaw is used. There is a method to balance the weight while increasing the weight like a key while sandwiching the fulcrum, the former has a contradiction that it is preferable for releasing the key but the key is heavy, and the latter has a complicated mechanism like a piano. Although a good touch can be obtained by pressing and releasing the key, there is a contradiction that the key release is generally slow with only a simple seesaw key. Therefore, even if the key and / or the hammer are light, the hammer stroke is increased to correspond to the key stroke, in other words, the speed increasing mechanism that increases the hammer speed corresponding to the key speed is adopted, in other words, the maximum stroke of the key is increased. There is a demand for a mechanism that drives the hammer at the point where it is obtained and that also has a speed-up mechanism.
Further, the feeling of stop at the end of key depression is also an important factor for the touch feeling. It is also desired that the touch feeling be changed for each key or group of keys to be key-scaled to obtain a natural feeling like a piano key, with a simple and inexpensive structure. However,
As described above, the innumerable restrictions have to be cleared, and thus the conventional keyboard device cannot escape from the various self-contradiction loops.

The present invention has been made in view of the above-mentioned various problems of the keyboard device of the electronic musical instrument described above. The electronic device has been made to address the problems of burrs and processing difficulties associated with metallic materials and to reduce the weight thereof. The purpose is to provide a mass body for keyboard instruments. A further object of the present invention is to reliably obtain a highly coupled state and to reduce the cost when the metal material and the resin material are integrally coupled to form a mass body. Further, in this case, it is also an object to provide a mass body that is lightweight and gives a heavy feeling, and further that prevents the stopper from being damaged by burrs and enables key scaling.

[0008]

In order to achieve the above object, in the invention according to claim 1, a support member, a key swingably supported by the support member, and a swing member with respect to the support member. In a keyboard device for an electronic musical instrument, which comprises a mass body that is freely supported and that is driven and oscillated through the force transmission section of the key, the mass body is a mass concentration section made of a rod-shaped metal material having a predetermined length. A resin portion having a swing supported portion,
There is provided a keyboard device for an electronic musical instrument, wherein the keyboard device is integrally formed.

The invention according to claim 2 is characterized in that the mass concentrated portion of the mass body is formed by rolling or drawing.

Further, the invention according to claim 3 is characterized in that the resin portion of the mass body is integrally formed by outsert molding on the outside of the mass concentration portion.

Further, the invention according to claim 4 is characterized in that the mass body is integrally formed by pressing the resin portion and the mass concentration portion.

Further, in the invention according to claim 5, the mass body is characterized in that the resin portion and the mass concentration portion are adhered to each other to be integrally formed.

Further, in the invention according to claim 6,
The mass concentration portion of the mass body is characterized in that a part thereof is deformed by header processing, bending processing, rolling processing or press processing.

Further, in the invention according to claim 7, a plurality of the keys and the mass body are provided, and the mass concentration portion of the mass body is
It is characterized in that the keys are formed with different lengths corresponding to each key or a key group consisting of a plurality of keys.

According to the invention of claim 8,
(A) A step of cutting a metal rod material formed by rolling or drawing into a predetermined length, (b) a step of forming a metal-working difficult portion with a resin, and (c) a step obtained in the step (a). It is characterized in that it comprises a step of integrally bonding the metal rod cut into a predetermined length and the resin obtained in the step (b).

Further, in the invention according to claim 9, a mass body interlocking with a key used in a keyboard device of an electronic musical instrument, comprising a long mass concentration part made of a metal material and a resin part holding the mass concentration part. The resin portion has a holding portion for outsert molding, press-contacting or adhering the mass concentration portion, and the holding portion has a thickness capable of holding the concentration portion as a whole over the embedded portion of the concentration portion. Along with the formation, a plurality of thin-walled portions thinner than this thickness are provided in the longitudinal axis direction, and these thin-walled portions are positioned so that the thin-walled portion is formed at least at a part of the periphery thereof over the entire length of the embedded portion. The feature is that they are staggered.

Further, in the invention according to claim 10, a mass body interlocked with a key used in a keyboard device of an electronic musical instrument,
It consists of a long mass concentration part made of a metal material and a resin part for holding it, and this resin part has a holding part for outsert molding or pressure welding or adhering the mass concentration part, and this holding part is It is characterized in that it is formed over the embedded portion of the concentrated portion with a thickness that can be held as a whole, and that a thin portion thinner than this thickness is provided corresponding to the end portion of the concentrated portion.

[0018]

In the invention according to claim 1, by constructing the mass body with the metal rod having a predetermined length and the resin portion, the mass material cost of the metal portion can be extremely reduced, and the whole keyboard device can be reduced. We are working to reduce costs.

This will be described below. Conventionally, FIG.
As shown in (a), since the mass body (mass concentrated part) was formed by press punching of the metal plate, the metal plate after punching remains, and the remaining part reaches about 70% of all materials, and this becomes scrap. It was abandoned. Applying this to the material cost, if the weight of the mass body is 50 g and the material cost of the iron plate is about 100 yen / Kg, the yield, which is the ratio of the material that is effectively used, is 30%. Material cost per piece is 0.05Kg / 0.3 × 100yen / K
g = 17 yen.

On the other hand, in the present invention, as shown in FIG. 5B, the metal rod is cut into a predetermined length and used as a mass body (mass concentrating portion). If it is formed by, the material cost per product is 0.05 Kg ÷ 1.0 because the yield is 100%.
× 100 yen / Kg = 5 yen. Furthermore, if the tip of the metal rod is bent to form the shape of a concentrated load so as to give the same feeling of weight, the weight can be reduced to about half, which is 25 g, and the material cost is about 2.5 yen. Assuming that the annual production quantity is about 10 million,
This shows that material costs of 140 to 150 million yen can be reduced.

Further, a portion of the mass body that is difficult to machine with metal, for example, at least a swing supported portion (fulcrum portion) of the mass body.
Since it is also formed of resin, it becomes easy to form a complicated shape portion. Here, the metal-working difficult part of the mass body is, in addition to the above-mentioned support part, a pressure contact spring locking part to the fulcrum part, a force transmission part, a switch actuator part, a key-incorporating guide piece to the mass part, a support member There is a slip-out prevention part after the mass body is incorporated, and it may be optionally formed in addition to the support part.

Further, by adopting a structure in which the support portion is not provided in the mass concentration portion of the metal rod and the support portion is provided in the resin portion, the center of mass (center of gravity) inevitably moves to the free end portion of the mass body. To do. The reason is that since the specific gravity of the resin is smaller than that of the metal, these combined products move toward the free end when the total mass of both is almost the same as compared with the mass body formed of only metal. Rotational moment increases. In other words, the masses of the rotating bodies having the same rotation moment may be small when the center of mass of the rotating body is moved away from the center of rotation (the length of the arm is increased). Therefore, the weight of the keyboard device can be reduced.

According to the second aspect of the present invention, since the mass concentrated portion of the mass body is formed by the rolling process or the drawing process, the portion where burrs are generated is extremely reduced, and the post-processing for deburring is unnecessary. it can. Furthermore, when the mass concentration part is held integrally with the resin part, even if burrs are generated in the extremely small burrs part where both ends are extremely small, the number of burrs is extremely small. Even if a crack in the covered resin contact part occurs, it is only in the relevant part (burr generation part), and most of the resin contact part does not crack, so there is no problem in strength and there is rattling. No noise is generated. Also,
Simplification of the manufacturing process can be achieved by eliminating the need for deburring work that was required in the past.

According to the third aspect of the present invention, the resin portion is outserted to the mass concentration portion of the metal, so that the reliable integral connection of the resin and the metal can be achieved by a simple operation or process.

In the invention according to claim 4, since the connection is made by pressing the two together, a reliable integral connection between the resin and the metal can be easily performed.

According to the fifth aspect of the present invention, since the connection is made by adhering the both, a reliable integral connection between the resin and the metal can be easily performed.

In the invention according to claim 6, a part of the mass concentrating portion is modified. For example, if the deformation is applied to the resin-bonded end, burrs do not occur at the end.
And by adopting one of the various modifications, the assembly with the resin becomes extremely good. Further, when the exposed end opposite to the resin connecting end is deformed, the burr disappears in the deformed part, so that the stopper abutting part can be smoothed and damage to the stopper member such as felt can be prevented. Further, if the area of the felt contact portion is increased by the deformation process, the action is further increased. If the deformation is applied to the intermediate portion or the exposed end portion, the center of mass of the mass body can be arbitrarily set. As a result, another keyboard device having a different touch feeling can be formed with only a small deformation.

In the invention according to claim 7, key scaling of a key touch feeling is performed by changing the length of the mass concentrated portion corresponding to each key or key group. For example, as the means for changing the length, it is only necessary to change the length at the time of cutting. Further, one having the same length at the time of cutting may be subjected to post-processing to compress (stretch) one end to change the length.

Further, the invention according to claim 1 or 6 or 7 is provided with a plurality of the keys and the mass body, and the mass concentration portion of the mass body corresponds to each key or a key group consisting of a plurality of keys. The invention according to claim 1 or 6 or 7 is characterized in that it is formed by changing the degree of deformation by press working, header working, bending work or rolling work at a portion excluding the resin connecting end. In the category of this feature, the lengths of the mass concentrated portions may or may not be the same, and include those in which the center of gravity of the mass body in the longitudinal direction is key-scaled by various processes. If the above various processes are performed at a certain distance from the center of rotation of the mass body, the machining end position is key-scaled, or the process is a bending process, and the bending process is performed at the free end of the mass concentration part. Considering, the key scaling of the degree of bending deformation is included. In the case of this bending process, key-scaling may be applied to the position where the bending process is performed, and the process of only this is also included in this concept.

According to the eighth aspect of the present invention, first, a metal rod formed by post-processing-free processing is cut into a predetermined length of about 20 cm or less corresponding to, for example, an ordinary keyboard musical instrument.
Next, a portion of the mass body that is not easily metallized, such as the swinging supported portion, is formed of resin. Subsequently, the metal rod and the resin are integrally bonded by, for example, resin outsert molding.
By adopting such a manufacturing process, there are the following effects as compared with the conventional case.

Significant cost reduction can be achieved.

It becomes easy to form a complex-shaped portion.

The weight of the mass body (keyboard device) can be reduced.

Even if the entire mass body is made light, its center of gravity can be formed outside the center of rotation, so that a good key touch feeling (weight feeling) can be maintained.

Since the portion where burrs are generated can be extremely reduced, post-processing for removing burrs can be made unnecessary and the manufacturing process can be simplified.

Even if burr is generated, it is minimal, so that it is possible to prevent the occurrence of cracks in the resin contact portion.

In the invention according to claim 9, the resin of the metal rod holding portion is formed by outsert, and the thin portion is formed in the metal rod holding portion. The thin portion is provided so as to be displaced over the entire length of the metal rod embedded portion so that at least a part of the periphery thereof becomes the thin portion. Due to such a thin portion, when a stress difference occurs between the metal rod and the resin due to heat change and external force during or after manufacturing,
The crack can be generated only in the thin portion, the position where the crack is generated can be set in advance at a certain position that does not affect the function, and the expansion of the crack can be prevented. The mass body of the present invention has a mechanism in which the yield does not deteriorate even if it is treated as a product on the distribution mechanism. That is, even if some deformation force is applied between the resin portion and the metal rod in the flow path, it is only to the extent that a crack is generated in the thin portion, and it is the same as the others. If it does, the metal rod will be deformed and this will cause defects.

According to the tenth aspect of the present invention, the resin of the metal rod holding portion is formed by outsert, and the thin portion is formed at the end portion on the embedded side of the metal rod. This effectively prevents the occurrence of cracks on the resin side due to the effects of burrs and bends that tend to be formed especially on the ends of the metal rod. According to the present invention, it is possible to completely shut out the adverse effects of the post-processing for deburring and the occurrence of burrs.

[0039]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional configuration diagram of a white key portion of a keyboard device according to an embodiment of the present invention, and FIGS. 2 and 3 are sectional views of portions indicated by IIA, IIB and IIIA, IIIB in FIG. It is a figure.

A rocking support portion 2 is formed at the rear end portion (right side in the figure) of the key (white key) 1, and the key 1 is a fulcrum portion 3 with respect to a support member 3.
It is swingably supported via 1. Below this key 1,
Mass body (hammer) consisting of mass concentration part 4 and resin part 5
6 is swingably attached via a hammer fulcrum 25. The mass concentrating portion 4 is made of, for example, a metal rod formed by drawing an iron material, and has a predetermined length (for example, 20c).
m). A tip portion 4a of a mass concentration portion 4 (hereinafter, simply referred to as a metal rod) made of this metal rod is folded back as shown in the drawing to form a folded back portion 4b. This folding operation can be easily automated. This allows
The mass of the tip portion of the metal rod is increased, and the rotational moment of the mass body 6 at the time of key pressing operation described later is increased, so that the feeling of weight at the time of key pressing can be increased.

The resin portion 5 is fixed to the base of the metal rod 4. The resin portion 5 is integrally mounted on the metal rod 4 by outsert molding, and includes a metal rod holding portion 7 that serves as a joint portion between the metal rod 4 and the resin portion 5, and a plate portion 5.
a and reinforcing ribs 5 formed on the plate portion 5a
and b.

A thin portion 8 is formed on the metal rod holding portion 7. As shown in FIG. 2A, the thin portions 8 are formed in a zigzag shape so that the positions of the thin portions 8 are alternately overlapped on both sides of the metal rod 4. The thin portions 8 are formed on both sides of the tip of the metal rod 4 in the figure. By forming such a thin portion 8, when a stress is generated due to a difference in thermal expansion (contraction) ratio between the resin and the metal rod due to heat or the like, the stress is concentrated on the thin portion which is easily broken from the beginning. Then, a crack can be generated in the thin portion 8 and escaped. Also,
Since there is a possibility that burrs are formed at the tip of the metal rod at the time of cutting, there is a high possibility that stress is generated due to the effect of burrs. The thin portions provided on both sides of the tip of the metal rod are for coping with cracks in the resin portion in consideration of such burrs. Thus, by forming the thin portion 8 continuously along substantially the entire length in the longitudinal direction of the metal rod 4 of the metal rod holding portion 7,
Even if cracks on the resin portion side caused by thermal stress or impact occur in any portion in the length direction of the metal rod, the stress can be released by limiting the cracks to a portion on the circumference thereof. The state of connection with the metal rod 4 can be stably maintained without rattling.

The mass body 6 is rotatably attached by fitting the swing supported portion 9 (the rotation fulcrum portion of the mass body) to the hammer fulcrum portion 25 provided on the support member 3 side. In this case, the protrusion 1 is provided on the swing supported portion 9 side which is a fulcrum of the mass body 6.
By providing 0 and inserting the projection 10 into a recess (not shown) provided on the hammer support shaft 25 side, it is possible to prevent lateral displacement and rattling of the mass body 6.
A pressure spring 26 for constantly pressing the swinging supported portion 9 toward the fulcrum portion 25 and the vibration supporting portion 2 against the fulcrum portion 31.
A (flat spring) is interposed between the mass body 6, the support member 3, and the support member and the key 1. The press-contact spring 26 is composed of, for example, an elongated strip-shaped spring, one end of which abuts on the rear side locking portion 28 of the fulcrum portion 9 of the mass body 6 and the other end (intermediate portion) of the step portion 27 on the support member 3 side. The hammer is pressed and brought into pressure contact with the hammer fulcrum portion 25 side, and the support portion 2 is pressed into contact with the fulcrum portion 31 at the extension end P.

The actuator 1 is attached to the resin portion 5 of the mass body 6.
1 is integrally molded. The actuator 11 has pressing portions 11 a and 11 b, and two rubber contacts 12 of a touch response switch 12 provided on a substrate 13 respectively.
A and 12b are sequentially pressed and deformed to sequentially make switches to obtain a signal corresponding to the key pressing speed (see the alternate long and short dash line in FIG. 1). The substrate 13 is provided with a support member 3 by a bolt or the like (not shown).
Is fixed to the lower surface side of. The support member 3 is provided with key guides 14a and 14b, a lower limit stopper 15a, and a black key over-keying stopper 15b below the positions of the tip and center of the key 1. Furthermore, a stopper 15 is also provided on the rear end of the key 1.
c is provided. During normal playing, the bent tip portion 4a of the metal rod 4 of the mass body 6 moves as shown by an arrow C and contacts the stopper 15c (see the alternate long and short dash line). That is, the lower limit stopper is constituted only by the stopper 15c of the hammer, and the other stoppers 15a and 15b contact the stopper 15c so that they function as stoppers when an excessive force greater than the key pressing force is applied. At the stroke lower limit position, there is formed a slight gap d with the key 1. When an excessive force acts, the key 1 swings around the swing support portion 2 at the rear end as shown by arrow A, and the key tip moves as shown by arrow B, and the lower edge of the key 1 moves. Contact the stoppers 15a and 15b, respectively. By providing the stoppers 15 at a plurality of places in this way, it is possible to prevent damage to the musical instrument by distributing the force when an excessive force acts on the keyboard and the instrument body. The connecting member 16 is provided on the inner surface of the lower surface of the key. The connecting member 16 is for transmitting the key pressing force by the key operation from the key 1 to the mass body 6 and the key releasing force from the mass body 6 to the key 1. The engaging portion between the connecting member 16 and the resin portion 5 of the mass body constitutes the force transmitting portion 17. Details of the force transmission portion 17 are shown in FIG. An L-shaped bent piece 16a is formed at the lower end of the connecting member 16 (see FIG. 1). The protruding piece 16a is a connecting shaft 18 made of an elastic member.
Engage the lower side. The connecting shaft 18 is detachably fixed to the lower part of the connecting member 16 and is sandwiched between an upper engaging piece 19a and two lower engaging pieces 19b provided on the resin portion 5 side of the mass body. The locking piece 19b is used as a key assembly guide.
It is formed longer than 9a to facilitate the work of assembling the key into the mass body. The connecting shaft 18 of the key connecting member 16 is guided to the locking piece 19b of the mass body that is inserted and arranged in the supporting member 2 in advance, and the connecting member 16 and the mass body 6 are connected via the elastic connecting shaft 18. By connecting via the connecting shaft 18 made of an elastic member as described above, the key pressing is performed in a state in which the two are smoothly connected without absorbing the shock at the time of key pressing and rattling them, and the mutual followability is good. The force can be reliably transmitted. The resin portion 5 of the mass body 6 is formed with a slip-out prevention portion 29 that protrudes somewhat upward to the rear side. The slip-out preventing portion 29 is brought into abutment engagement with the end portion 30 on the key supporting member 3 side,
The mass body 6 is prevented from coming out backward (to the right in the drawing). When the mass body 6 is taken out for repair or replacement, etc., the mass body 6 is rotated clockwise in the drawing and pushed down, so that the slip-out preventing portion 29 is provided at the end portion 3 of the key support member 3.
The mass body is pulled out in a state of being disengaged by moving it downward from 0.

The present invention has a large number of friendly elements as described in the problems. To put it more simply, the idea of technical contradiction and technical problem,
Many problems have been solved by repeating the trial production.

Among the above problems, the present invention will be reviewed and other aspects will be focused on the elements of "cheap", "light", "no burr", "good touch feeling", and "touch feeling key scaling". Consider also the example.

First, as described in the operation of claim 1, it is shown that the more the displacement of the center of gravity of the object (mass body) in the direction of the free end is, the lighter the rotation moment becomes. In this sense, the tip portion 4a of the mass concentration portion of FIG. 1 is folded back to form the folded portion 4b. Detailed description of this manufacturing method or configuration will explain how many technical problems have been solved.

FIG. 5 (c) is a more detailed view of FIG. 5 (b) showing a method of cutting a long metal rod to form a mass concentrated portion.

Roll bar 40 having a diameter of 1 m or more
While straightening the tip of the, while being guided by the guide portion 51 on the base 50 to slide to the left, through the guide and fixed tubular member 31 fixed on the base 30 and slidable in the rod longitudinal direction, The stopper body 32 fixed to the table 30 is brought into contact with the stopper body 32.

Then, the bar material is cut by the cutter blade 33 which is interlocked with the pusher 34 arranged above the outer side of the end surface of the base 50 as shown by the arrow.

Immediately after cutting, the pusher 34 is interlocked, and then independently moves below the blade 33 to bend the folded portion 4b to the position 4b 'with the tip T as a fulcrum.

The pusher 34 and the cutter blade 33 are raised to the preset position.

At the position shown in the figure, the pusher 35 in the standby state is bent to the left to proceed to the completed state shown in FIG. in this case,
When it is difficult to bend, the upward movement of the auxiliary pusher 36 is also used.

Bar material that has been bent (mass concentration part 4)
The front end portion 4d is pushed to the right by the laterally slidable push-out rod 32a on the stopper body 32, and the base 30 moves to the left almost at the same time as this operation.

The bar is released from the tubular member 31 and received by the saucer container 38 provided below it.

Each of the above-described operations 1 to 3 is performed almost automatically by the computer or relay sequence control of each moving member, but may be performed manually. What I would like to pay attention to in this series of operations is how burr treatment is performed during cutting. Burrs, if any, occur below the cutting. The burr 4c is on the inside when the folding is completed. The burr portion of the other end 4d is covered with an outsert. Since it is only here that is dangerous in the burr portion, even if the above-mentioned stress difference occurs, it is small and does not lead to total destruction of the joint portion with the resin. However, in the embodiment shown in FIG. 1, since the die machining is slight, a thin portion is also formed at this end together with the other thin portion 8 so that the strength breakage due to resin cracking is eliminated.

In FIG. 5 (c), the length of the folded-back portion is changed by further effectively utilizing the fact that the base 30 has to be moved in the work for removing the bar material and setting an arbitrary predetermined position as a preset position. It is possible to That is, if the table 30 is moved leftward (rightward) and cut and bent, a product having the same apparent overall length L and a long (short) folded-back portion length 13 can be obtained. (Figs. 1 and 4
(D)). As a result, a keyboard device having different reaction forces between the keys or the key groups can be obtained, and a so-called key case ring having a key touch feeling becomes possible. In addition, as it is repeated many times, since the mass is concentrated on the free end portion, a lighter and better touch feeling (weight feeling) can be obtained as compared with the case where the mass is uniformly distributed or the mass is concentrated on the rotation center.

Next, another embodiment (an example in which the degree of deformation is changed by various kinds of processing) for solving the above problems will be described with reference to FIG.

FIG. 4 (a) is a view showing a main part of the mass concentrating portion 4 in which one end after cutting the bar material is processed into a header. To form the processed portion, the post-cutting base 30 is moved to the left, and the right end portion is hit from the right side with a huge hammer member having a head-shaped recess. For convenience of explanation, FIG. 5C is diverted, but it is mechanically superior to realize this work with a device in which the right side is up and the left side is down.

FIG. 4 (b) is a diagram showing a main part in which one end of the mass concentrating portion 4 is made non-uniform by rolling the one end after cutting the bar material.

FIG. 4 (c) is a view showing a main part in which the mass distribution of the mass concentration part 4 is made non-uniform by pressing one end after cutting the bar material. In this example, the wide area portion is provided with the stopper 15
Arrange so as to abut C.

By performing the processing shown in FIGS. 4 (a) to 4 (C), the same operational effects as those in FIGS. 4 (d) and 1 can be obtained. To add a little explanation, the burr treatment is different. FIG.
In (d), the burr is left as it is and is harmless.
In (a) to (c), it is eliminated by the processing itself. Then, if the respective dimensions of each pair of l ₁ , D ₁ , l ₂ , D ₂ , l ₃ , and D ₃ are arbitrarily changed at the time of processing, a keyboard device in which a desired key touch feeling key scaling is applied is obtained.

FIG. 4 (e) shows still another example in which the degree of deformation is changed, and an example in which key touch feeling key scaling is performed by forming several types of mass concentrated portions having different bending angles θ of the tip portion. Shows.

In the embodiment shown in FIG. 1, since the key stopper is eliminated and the concave key stopper is commonly used as the hammer stopper 15C, the stopper feeling is good when the key is pressed, and the good touch feeling (weight feeling) is combined. It also provides a good touch feeling.

[0065]

As described above, according to the first aspect of the invention, the support member, the key swingably held by the support member, and the swing member supported by the support member, In a keyboard device for an electronic musical instrument, which comprises a mass body that is driven and oscillated via a force transmission section of the key, the mass body includes a mass concentration section made of a rod-shaped metal material having a predetermined length, and an oscillating supported section. Since it is configured as a keyboard device for an electronic musical instrument characterized by being integrally formed with a resin portion having a, the use of a rod-shaped metal material eliminates the waste of material and reduces the material cost of the mass body to the conventional one. It can be significantly reduced compared to.

Further, since the mass body is formed of the metal rod having a predetermined length and the resin portion, a portion of the mass body which is difficult to process with metal, for example, a swing supported portion (fulcrum portion) of the mass body. The pressure contact spring engagement portion to the fulcrum portion, the force transmission portion, the switch actuator portion, the key-incorporating guide piece to the mass body, the slip-out preventing portion after the mass body is assembled to the support member, and the like can be formed of resin. This facilitates the formation of a complicatedly shaped portion and reduces the weight.

In the invention according to claim 2, since the mass-concentrated portion of the mass body is formed by rolling or drawing, the portion where burrs are generated is extremely reduced, and post-processing for deburring is unnecessary. it can. Furthermore, when the mass concentration part is held integrally with the resin part, even if burrs are generated in the extremely small burrs part where both ends are extremely small, the number of burrs is extremely small. Even if a crack in the covered resin contact part occurs, it is only in the relevant part (burr generation part), and most of the resin contact part does not crack, so there is no problem in strength and there is rattling. No noise is generated. Also,
Simplification of the manufacturing process can be achieved by eliminating the need for deburring work that was required in the past.

According to the third aspect of the present invention, the resin portion is outserted to the mass concentration portion of the metal, so that the reliable integral connection of the resin and the metal can be achieved by a simple operation or process.

In the invention according to claim 4, since the connection is made by pressing the two together, a reliable integral connection between the resin and the metal can be easily made.

According to the fifth aspect of the invention, since the connection is made by adhering the both, a reliable and integral connection between the resin and the metal can be easily performed.

In the invention according to claim 6, a part of the mass concentrating portion is modified. For example, if the deformation is applied to the resin-bonded end, burrs do not occur at the end.
And by adopting one of the various modifications, the assembly with the resin becomes extremely good. Further, when the exposed end opposite to the resin connecting end is deformed, the burr disappears in the deformed part, so that the stopper abutting part can be smoothed and damage to the stopper member such as felt can be prevented. Further, if the area of the felt contact portion is increased by the deformation process, the action is further increased. If the deformation is applied to the intermediate portion or the exposed end portion, the center of mass of the mass body can be arbitrarily set. As a result, another keyboard device having a different touch feeling can be formed with only a small deformation.

In the invention according to claim 7, the key scaling of the key touch feeling is performed by changing the length of the mass concentration part corresponding to each key or key group. For example, as the means for changing the length, it is only necessary to change the length at the time of cutting. Further, one having the same length at the time of cutting may be subjected to post-processing to compress (stretch) one end to change the length.

According to the eighth aspect of the present invention, first, the metal rod formed by the post-processing unnecessary process is cut into a predetermined length of about 20 cm or less corresponding to, for example, an ordinary keyboard musical instrument.
Next, a portion of the mass body that is not easily metallized, such as the swinging supported portion, is formed of resin. Subsequently, the metal rod and the resin are integrally bonded by, for example, resin outsert molding.
By adopting such a manufacturing process, there are the following effects as compared with the conventional case.

Significant cost reduction can be achieved. It becomes easy to form a complex shaped portion. The weight of the mass body (keyboard device) can be reduced. Even if the entire mass body is made light, its center of gravity can be formed outside the center of rotation, so that a good key touch feeling (weight feeling) can be maintained. Since it is possible to extremely reduce the portion where burrs are generated, it is possible to eliminate the need for post-processing for removing burrs and simplify the manufacturing process. Even if burr is generated, it is extremely small, so that it is possible to prevent the occurrence of cracks in the resin contact portion.

In the invention according to claim 9, the resin of the metal rod holding portion is formed by outsert, and the thin portion is formed in the metal rod holding portion. The thin portion is provided so as to be displaced over the entire length of the metal rod embedded portion so that at least a part of the periphery thereof becomes the thin portion. Due to such a thin portion, when a stress difference occurs between the metal rod and the resin due to heat change and external force during or after manufacturing,
The crack can be generated only in the thin portion, the position where the crack is generated can be set in advance at a certain position that does not affect the function, and the expansion of the crack can be prevented.

In the tenth aspect of the invention, the resin of the metal rod holding portion is formed by outsert, and the thin portion is formed at the end portion on the embedded side of the metal rod. This effectively prevents the occurrence of cracks on the resin side due to the effects of burrs and bends that tend to be formed especially on the ends of the metal rod. According to the present invention, it is possible to completely shut out the adverse effects of the post-processing for deburring and the occurrence of burrs.

Summarizing the above as a whole, in the present invention, by using the rod-shaped metal material, the waste of the material is eliminated, and the material cost of the mass body can be largely reduced as compared with the conventional case. Further, since the mass body is formed of the metal rod having a predetermined length and the resin portion, a portion of the mass body that is difficult to process with metal, for example, a swing supported portion (fulcrum portion) or a fulcrum portion of the mass body. The pressure contact spring locking portion, the force transmitting portion, the switch actuator portion, the key-incorporating guide piece to the mass body, the slip-out preventing portion after the mass body is assembled to the support member, and the like can be made of resin. This facilitates the formation of a complicatedly shaped portion and reduces the weight.

Further, since the resin portion is integrally formed by outsert on one end side of the metal rod which is the mass concentration portion of the mass body formed by the post-processing unnecessary processing such as rolling or drawing, Since a reliable integral connection with metal is achieved in a simple process and burr does not occur,
Post-processing for removing burrs is not required, the manufacturing process is simplified, and cracks at the resin contact portion due to burrs are prevented.

Further, by the thin portion provided in the metal rod holding portion, when a stress difference occurs between the metal rod and the resin, the crack can be generated only within the thin portion, and the position where the crack is generated can be generated. Can be predetermined at a fixed position that does not affect the function, and the expansion of cracks can be prevented.

Further, when cutting the metal rod, the length of the metal rod is changed for each key or key group and the metal rod is cut to a predetermined length. Can be changed for each key or for each key group, and the desired key touch feeling key scaling can be easily and reliably performed according to the mass corresponding to the length of the metal rod.

Further, after the metal rod formed by the post-processing-free processing is cut into a predetermined length, one end thereof is further deformed by header processing, bending processing or rolling processing, and this deformed portion is a stopper at the end of the metal rod. By providing the abutting portion, the mass is concentrated on the end portion, and a touch feeling with a sense of weight can be obtained without actually increasing the weight. Moreover, the stopper abutting portion can be further smoothed by the deformation process, and the stopper member made of felt or the like can be prevented from being damaged.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a cross section of a keyboard provided with a mass body according to an embodiment of the present invention.

2 (A) and (B) are IIA-II of FIG. 1, respectively.
It is sectional drawing which followed the A line and the IIB-IIB line.

3A and 3B are IIIA-I of FIG. 1, respectively.
It is sectional drawing which followed the IIA line and the IIIB-IIIB line.

FIG. 4 is an explanatory diagram of another example of changing the degree of deformation of the rod-shaped metal member of the mass body according to the present invention.

FIG. 5 is an effect explanatory view for explaining the cost effect of the present invention in comparison with the prior art.

[Explanation of symbols]

1: White key, 2: Swing support part, 3: Key support member, 4: Mass concentration part, 5: Resin part, 6: Mass body, 7: Metal rod holding part,
8: Thin part, 9: Swing supported part (fulcrum part), 10: Protrusion, 11: Actuator, 14: Key guide, 15: Stopper, 16: Connection member, 17: Force transmission part, 18: Connection shaft, 26: Pressure contact spring.

Claims (10)

[Claims] 1. A support member, a key swingably held by the support member, a swingable support by the support member, and the drive member swings through a force transmission portion of the key. In a keyboard device of an electronic musical instrument comprising a mass body, the mass body integrally includes a mass concentration part made of a rod-shaped metal material having a predetermined length, and a resin part having a swing supported part. A keyboard device for electronic musical instruments characterized by. 2. The keyboard device for an electronic musical instrument according to claim 1, wherein the mass concentrated portion of the mass body is formed by rolling or drawing. 3. The keyboard device for an electronic musical instrument according to claim 1, wherein the resin portion of the mass body is integrally formed outside the mass concentration portion by outsert molding. 4. The keyboard device for an electronic musical instrument according to claim 1, wherein the mass body is formed integrally by pressing the resin portion and the mass concentrating portion. 5. The keyboard device for an electronic musical instrument according to claim 1, wherein the mass body is integrally formed by bonding the resin portion and the mass concentrating portion. 6. The electronic musical instrument according to claim 1, wherein the mass concentrated portion of the mass body is formed by deforming a part of the mass concentrated portion by header processing, bending processing, rolling processing or press processing. Keyboard device. 7. A plurality of the keys and the mass body are provided, and a mass concentrating portion of the mass body is formed by changing a length corresponding to each key or a key group including a plurality of keys. The keyboard device for an electronic musical instrument according to claim 1. 8. (a) A step of cutting a metal rod material formed by rolling or drawing into a predetermined length, and (b)
A step of forming a metal-working difficult portion with a resin, and (c) a step of integrally bonding the metal rod cut into a predetermined length obtained in the step (a) and the resin obtained in the step (b) A method for manufacturing a mass body in a keyboard device of an electronic musical instrument, comprising: 9. A mass body interlocking with a key used in a keyboard device of an electronic musical instrument, comprising a long mass concentrating portion made of a metal material and a resin portion holding the mass concentrating portion. A holding portion for outsert molding, press-contacting or adhering the concentrated portion is provided, and the holding portion is formed over the embedded portion of the concentrated portion with a thickness capable of holding the concentrated portion as a whole, and is thinner than this thickness. A plurality of thin-walled portions are provided in the longitudinal axis direction, and these thin-walled portions are provided so as to be displaced over the entire length of the embedded portion so that the thin-walled portion is formed in at least a part of the periphery thereof. The mass body of the keyboard device of an electronic musical instrument. 10. A mass body interlocking with a key used in a keyboard device of an electronic musical instrument, comprising a long mass concentration portion made of a metal material and a resin portion holding the mass concentration portion.
The mass concentration part has a holding part for outsert molding, press contacting or adhering, and the holding part is formed over the embedded part of the concentration part with a thickness that can be held as a whole, and a thin part thinner than this thickness. A mass body for a keyboard device of an electronic musical instrument, characterized in that a mass is provided corresponding to an end portion of the concentrated portion.